The best screwed clamps on the market with a hardness of 8.8 for #10 spanner. Their performance outclass any other clamps available in stores and on Allegro. The thickness of the clamp is as high as 1.5 mm, and the width is 25 mm! Photos do not show the solidity and greatness of these clamps.
The scope of use is 68-73 mm (in practice +1 mm on each side).
They are used for screwing silicone connectors with a mounting diameter of